Sentences with phrase «adaptive changes in populations»

Macroevolution posed a problem to Darwin because his principle of descent with modification predicts gradual transitions between small - scale adaptive changes in populations and these larger - scale phenomena, yet there is little evidence for such transitions in nature.

Not exact matches

Say we have a population of animals which has to meet some new challenge offered to it by an altered environment; there may be some individuals in the population whose development is changed by the environment in a way which makes them better able to deal with the challenge — they show a capacity for adaptive modification.

Until now, changes in the relative proportion of rare mutations, that could be both detrimental and adaptive, had only been shown over relatively long timescales, by comparing African and European populations.

«Our findings illustrate how adaptive humans were nearly 14,500 years ago in a period of climatic change: Wild sheep offered the Natufian and later Pre-Pottery Neolithic populations one of a myriad of resources that could be exploited during the Late Pleistocene even in this more marginal environment beyond the Mediterranean zone.

Maintenance of biodiversity in a rapidly changing climate will depend on the efficacy of evolutionary rescue, whereby population declines due to abrupt environmental change are reversed by shifts in genetically driven adaptive traits.

Adaptive evolution, i.e. genetic change via natural selection, plays a central role in how plant and animal populations guarantee their long - term survival.

This frontier research needs to be furthered by conducting surveys and excavations in various environmental zones of Arabia in order to recover ecological data and information on hominin population history and changing adaptive behaviours.

In addition to E, several NS5 amino acid changes were unique to the 2007 - 2008 epidemic in Venezuela and may give additional insight into the adaptive response of DENV - 3 at the population leveIn addition to E, several NS5 amino acid changes were unique to the 2007 - 2008 epidemic in Venezuela and may give additional insight into the adaptive response of DENV - 3 at the population levein Venezuela and may give additional insight into the adaptive response of DENV - 3 at the population level.

From genomic and epigenomic sequences from a subset of the populations, we see changes in methylation patterns between the evolved populations over-represented in some functional categories of genes, which is consistent with some of these differences being adaptive.

Prior to joining UCS in 2005, Ms. Spanger - Siegfried was an associate scientist at the U.S. Center of the Stockholm Environment Institute, where for six years her work focused on understanding and building the adaptive capacity of vulnerable populations and sectors in developing countries in response to climate change.

• Improved understanding of climate thresholds and vulnerabilities, impacts, and adaptive responses in a variety of different local contexts across the country • Improved understanding of vulnerable populations (e.g., urban poor, native populations on tribal lands) that have limited capacities for responding to climate change • Ways to build adaptive capacity that can be generalized across individuals, communities, and countries • Decision support tools for entities responsible for hazard mitigation and management • Collection of socioeconomic research to inform impact, vulnerability, and adaptation research

• The readiness of the nation to predict and avoid public and occupational health problems caused by heat waves and severe storms • Characterization and quantification of relationships between climate variability, health outcomes, and the main determinants of vulnerability within and between populations • Development of reliable methods to connect climate - related changes in food systems and water supplies to health under different conditions • Prediction of future risks in response to climate change scenarios and of reductions in the baseline level of morbidity, mortality, or vulnerability • Identification of the available resources, limitations of, and potential actions by the current U.S. health care system to prevent, prepare for, and respond to climate - related health hazards and to build adaptive capacity among vulnerable segments of the U.S. population

This activity report describes a FAO - supported project designed to improve the adaptive capacities of rural populations and their resilience to drought and other climate change impacts in Bangladesh.

First, it is a short generation time relative to the speed of environmental change that makes «reproducing rapidly» relevant to the ability of a species / population to track environmental changes in an adaptive manner.